-#serial 1
+#serial 8
-dnl From grep.
+dnl Initially derived from code in GNU grep.
+dnl Mostly written by Jim Meyering.
-AC_DEFUN(jm_WITH_REGEX,
+dnl Usage: jm_INCLUDED_REGEX([lib/regex.c])
+dnl
+AC_DEFUN(jm_INCLUDED_REGEX,
[
- AC_ARG_WITH(included-regex,
- [ --without-included-regex don't compile regex],
- USE_REGEX=$withval,
- USE_REGEX=yes)
+ dnl Even packages that don't use regex.c can use this macro.
+ dnl Of course, for them it doesn't do anything.
- test "$USE_REGEX" = "yes" && LIBOBJS="$LIBOBJS regex.o"
+ # Assume we'll default to using the included regex.c.
+ ac_use_included_regex=yes
+
+ # However, if the system regex support is good enough that it passes the
+ # the following run test, then default to *not* using the included regex.c.
+ # If cross compiling, assume the test would fail and use the included
+ # regex.c. The first failing regular expression is from `Spencer ere
+ # test #75' in grep-2.3.
+ AC_CACHE_CHECK([for working re_compile_pattern],
+ jm_cv_func_working_re_compile_pattern,
+ AC_TRY_RUN(
+[#include <stdio.h>
+#include <regex.h>
+ int
+ main ()
+ {
+ static struct re_pattern_buffer regex;
+ const char *s;
+ re_set_syntax (RE_SYNTAX_POSIX_EGREP);
+ /* Add this third left square bracket, [, to balance the
+ three right ones below. Otherwise autoconf-2.14 chokes. */
+ s = re_compile_pattern ("a[[:]:]]b\n", 9, ®ex);
+ /* This should fail with _Invalid character class name_ error. */
+ if (!s)
+ exit (1);
+
+ /* This should succeed, but doesn't for e.g. glibc-2.1.3. */
+ s = re_compile_pattern ("{1", 2, ®ex);
+
+ exit (s ? 1 : 0);
+ }
+ ],
+ jm_cv_func_working_re_compile_pattern=yes,
+ jm_cv_func_working_re_compile_pattern=no,
+ dnl When crosscompiling, assume it's broken.
+ jm_cv_func_working_re_compile_pattern=no))
+ if test $jm_cv_func_working_re_compile_pattern = yes; then
+ ac_use_included_regex=no
+ fi
+
+ test -n "$1" || AC_MSG_ERROR([missing argument])
+ syscmd([test -f $1])
+ ifelse(sysval, 0,
+ [
+
+ AC_ARG_WITH(included-regex,
+ [ --without-included-regex don't compile regex; this is the default on
+ systems with version 2 of the GNU C library
+ (use with caution on other system)],
+ jm_with_regex=$withval,
+ jm_with_regex=$ac_use_included_regex)
+ if test "$jm_with_regex" = yes; then
+ AC_LIBOBJ(regex)
+ fi
+ ],
+ )
]
)